generic: 5.15: refresh config

Refresh kernel 5.15 generic config file

Signed-off-by: Ansuel Smith <[email protected]>
[added some missing Kconfig symbols]
Signed-off-by: Daniel Golle <[email protected]>

target/linux/mediatek/Makefile

@@ -9,6 +9,7 @@ SUBTARGETS:=mt7622 mt7623 mt7629
 FEATURES:=dt-overlay emmc fpu gpio nand pci pcie rootfs-part separate_ramdisk squashfs usb
 
 KERNEL_PATCHVER:=5.10
+KERNEL_TESTING_PATCHVER:=5.15
 
 include $(INCLUDE_DIR)/target.mk
 DEFAULT_PACKAGES += \