imx: switch to kernel 6.1

I have this kernel running for weeks some
on a lot of boards in multiple scenarios

Signed-off-by: Koen Vandeputte <[email protected]>

target/linux/imx/Makefile

@@ -10,8 +10,7 @@ BOARDNAME:=NXP i.MX
 FEATURES:=audio display fpu gpio pcie rtc usb usbgadget squashfs targz nand ubifs boot-part rootfs-part
 SUBTARGETS:=cortexa7 cortexa9
 
-KERNEL_PATCHVER:=5.15
-KERNEL_TESTING_PATCHVER:=6.1
+KERNEL_PATCHVER:=6.1
 
 include $(INCLUDE_DIR)/target.mk