kernel: bump 5.15 to 5.15.72

Removed upstreamed:
  generic/pending-5.15/722-net-mt7531-only-do-PLL-once-after-the-reset.patch[1]
  bcm53xx/patches-5.15/082-v6.0-clk-iproc-Do-not-rely-on-node-name-for-correct-PLL-s.patch[2]

All other patches automatically rebased

Build system: x86_64
Build-tested: bcm2711/RPi4B, mt7622/RT3200, mvebu/cortexa72
Run-tested: bcm2711/RPi4B, mt7622/RT3200, mvebu/cortexa72 (RB5009UG+S+IN)

1. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.15.72&id=5de02ab84aeca765da0e4d8e999af35325ac67c2
2. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.15.72&id=ab5c5787ab5ecdc4a7ea20b4ef542579e1beb49d

Signed-off-by: John Audia <therealgraysky@proton.me>

target/linux/ath79/patches-5.15/401-mtd-nor-support-mtd-name-from-device-tree.patch

@@ -34,7 +34,7 @@ Signed-off-by: Abhimanyu Vishwakarma <Abhimanyu.Vishwakarma@imgtec.com>
  	mtd->type = MTD_NORFLASH;
 --- a/drivers/mtd/mtdcore.c
 +++ b/drivers/mtd/mtdcore.c
-@@ -849,6 +849,17 @@ out_error:
+@@ -851,6 +851,17 @@ out_error:
   */
  static void mtd_set_dev_defaults(struct mtd_info *mtd)
  {

target/linux/ath79/patches-5.15/920-mikrotik-rb4xx.patch

@@ -58,7 +58,7 @@ Submitted-by: Christopher Hill <ch6574@gmail.com>
 +	  Routerboard RB4xx series.
 +
  config SGI_MFD_IOC3
-	bool "SGI IOC3 core driver"
+ 	bool "SGI IOC3 core driver"
  	depends on PCI && MIPS && 64BIT
 --- a/drivers/mfd/Makefile
 +++ b/drivers/mfd/Makefile

target/linux/ath79/patches-5.15/939-mikrotik-rb91x.patch

@@ -44,8 +44,8 @@ Tested-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
  	tristate "Xylon LogiCVC GPIO support"
  	depends on MFD_SYSCON && OF
 @@ -529,6 +536,10 @@ config GPIO_ROCKCHIP
-	help
-	  Say yes here to support GPIO on Rockchip SoCs.
+ 	help
+ 	  Say yes here to support GPIO on Rockchip SoCs.
  
 +config GPIO_RB91X_KEY
 +	tristate "MikroTik RB91x board series reset key support"