kernel: bump 5.4 to 5.4.188

Added the new configuration options:
CONFIG_HARDEN_BRANCH_HISTORY=y
CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY=y

Manually adapted:
target/linux/generic/hack-5.4/220-gc_sections.patch

Compile-tested: lantiq/xrx200, armvirt/64
Run-tested: lantiq/xrx200, armvirt/64

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/generic/hack-5.4/220-gc_sections.patch

@@ -72,7 +72,7 @@ Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
  
 --- a/arch/arm/kernel/vmlinux.lds.h
 +++ b/arch/arm/kernel/vmlinux.lds.h
-@@ -22,13 +22,13 @@
+@@ -22,7 +22,7 @@
  #define ARM_MMU_DISCARD(x)
  #else
  #define ARM_MMU_KEEP(x)
@@ -80,6 +80,8 @@ Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
 +#define ARM_MMU_DISCARD(x)	KEEP(x)
  #endif
  
+ /*
+@@ -41,7 +41,7 @@
  #define PROC_INFO							\
  		. = ALIGN(4);						\
  		__proc_info_begin = .;					\
@@ -88,7 +90,7 @@ Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
  		__proc_info_end = .;
  
  #define HYPERVISOR_TEXT							\
-@@ -39,11 +39,11 @@
+@@ -52,11 +52,11 @@
  #define IDMAP_TEXT							\
  		ALIGN_FUNCTION();					\
  		__idmap_text_start = .;					\
@@ -102,7 +104,7 @@ Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
  		__hyp_idmap_text_end = .;
  
  #define ARM_DISCARD							\
-@@ -86,12 +86,12 @@
+@@ -99,12 +99,12 @@
  	. = ALIGN(8);							\
  	.ARM.unwind_idx : {						\
  		__start_unwind_idx = .;					\
@@ -117,20 +119,21 @@ Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
  		__stop_unwind_tab = .;					\
  	}
  
-@@ -102,14 +102,14 @@
- #define ARM_VECTORS							\
- 	__vectors_start = .;						\
- 	.vectors 0xffff0000 : AT(__vectors_start) {			\
--		*(.vectors)						\
-+		KEEP(*(.vectors))					\
- 	}								\
- 	. = __vectors_start + SIZEOF(.vectors);				\
- 	__vectors_end = .;						\
+@@ -116,7 +116,7 @@
+ 	__vectors_lma = .;						\
+ 	OVERLAY 0xffff0000 : NOCROSSREFS AT(__vectors_lma) {		\
+ 		.vectors {						\
+-			*(.vectors)					\
++			KEEP(*(.vectors))				\
+ 		}							\
+ 		.vectors.bhb.loop8 {					\
+ 			*(.vectors.bhb.loop8)				\
+@@ -134,7 +134,7 @@
  									\
- 	__stubs_start = .;						\
- 	.stubs ADDR(.vectors) + 0x1000 : AT(__stubs_start) {		\
+ 	__stubs_lma = .;						\
+ 	.stubs ADDR(.vectors) + 0x1000 : AT(__stubs_lma) {		\
 -		*(.stubs)						\
 +		KEEP(*(.stubs))						\
  	}								\
- 	. = __stubs_start + SIZEOF(.stubs);				\
- 	__stubs_end = .;						\
+ 	ARM_LMA(__stubs, .stubs);					\
+ 	. = __stubs_lma + SIZEOF(.stubs);				\

target/linux/generic/hack-5.4/251-sound_kconfig.patch

@@ -92,7 +92,7 @@ Signed-off-by: John Crispin <john@phrozen.org>
  	bool
 --- a/lib/Kconfig
 +++ b/lib/Kconfig
-@@ -402,16 +402,16 @@ config BCH_CONST_T
+@@ -401,16 +401,16 @@ config BCH_CONST_T
  # Textsearch support is select'ed if needed
  #
  config TEXTSEARCH

target/linux/generic/hack-5.4/902-debloat_proc.patch

@@ -330,7 +330,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  
 --- a/net/core/sock.c
 +++ b/net/core/sock.c
-@@ -3643,6 +3643,8 @@ static __net_initdata struct pernet_oper
+@@ -3641,6 +3641,8 @@ static __net_initdata struct pernet_oper
  
  static int __init proto_init(void)
  {