kernel: bump 5.4 to 5.4.105

Ran update_kernel.sh in a fresh clone without any existing toolchains.

Removed upstreamed generic-backports:
  830-v5.12-0001-net-usb-qmi_wwan-support-ZTE-P685M-modem.patch
  831-v5.9-usbip-tools-fix-build-error-for-multiple-definition.patch
  755-v5.8-net-dsa-add-GRO-support-via-gro_cells.patch

Build system: x86_64
Build-tested: ipq806x/R7800
Run-tested: ipq806x/R7800

No dmesg regressions, everything functional

Signed-off-by: John Audia <graysky@archlinux.us>
Tested-by: Curtis Deptuck <curtdept@me.com> [x86/64]
[squash patches]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/generic/pending-5.4/306-mips_mem_functions_performance.patch

@@ -25,7 +25,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  	-DBOOT_HEAP_SIZE=$(BOOT_HEAP_SIZE) \
 --- a/arch/mips/include/asm/string.h
 +++ b/arch/mips/include/asm/string.h
-@@ -140,4 +140,42 @@ extern void *memcpy(void *__to, __const_
+@@ -19,4 +19,42 @@ extern void *memcpy(void *__to, __const_
  #define __HAVE_ARCH_MEMMOVE
  extern void *memmove(void *__dest, __const__ void *__src, size_t __n);
  

target/linux/generic/pending-5.4/690-net-add-support-for-threaded-NAPI-polling.patch

@@ -280,7 +280,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  
  	/* Some drivers may have called napi_schedule
  	 * prior to exhausting their budget.
-@@ -10271,6 +10332,10 @@ static int __init net_dev_init(void)
+@@ -10313,6 +10374,10 @@ static int __init net_dev_init(void)
  		sd->backlog.weight = weight_p;
  	}