kernel: bump 4.19 to 4.19.84

Refreshed all patches.

Altered patches:
- 950-0748-net-bcmgenet-Workaround-for-Pi-4B-network-issue.patch
- 950-0754-Revert-net-bcmgenet-Workaround-for-Pi-4B-network-iss.patch
- 902-debloat_proc.patch

Remove upstreamed:
- 150-MIPS-bmips-mark-exception-vectors-as-char-arrays.patch

New symbols:
X86_INTEL_MPX
X86_INTEL_MEMORY_PROTECTION_KEYS
X86_INTEL_TSX_MODE_OFF
X86_INTEL_TSX_MODE_ON
X86_INTEL_TSX_MODE_AUTO

Compile-tested on: cns3xxx, x86_64
Runtime-tested on: cns3xxx

Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>

target/linux/generic/hack-4.19/721-phy_packets.patch

@@ -56,7 +56,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
   */
 --- a/include/linux/skbuff.h
 +++ b/include/linux/skbuff.h
-@@ -2529,6 +2529,10 @@ static inline int pskb_trim(struct sk_bu
+@@ -2545,6 +2545,10 @@ static inline int pskb_trim(struct sk_bu
  	return (len < skb->len) ? __pskb_trim(skb, len) : 0;
  }
  
@@ -67,7 +67,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  /**
   *	pskb_trim_unique - remove end from a paged unique (not cloned) buffer
   *	@skb: buffer to alter
-@@ -2660,16 +2664,6 @@ static inline struct sk_buff *dev_alloc_
+@@ -2676,16 +2680,6 @@ static inline struct sk_buff *dev_alloc_
  }