at91: use kernel 6.6 by default

Switch to Linux kernel version 6.6.

Signed-off-by: Mieczyslaw Nalewaj <[email protected]>

target/linux/at91/Makefile

@@ -10,8 +10,7 @@ BOARDNAME:=Microchip (Atmel AT91)
 FEATURES:=ext4 squashfs targz usbgadget ubifs
 SUBTARGETS:=sama7 sama5 sam9x
 
-KERNEL_PATCHVER:=6.1
-KERNEL_TESTING_PATCHVER:=6.6
+KERNEL_PATCHVER:=6.6
 
 include $(INCLUDE_DIR)/target.mk