The kernel configuration option CONFIG_MACH_MT7629 selects
CONFIG_HAVE_ARM_ARCH_TIMER now. Handle this change in the config-5.10.
This fixes some build problems.
Fixes: 81530d69ef58 ("kernel: bump 5.10 to 5.10.121")
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>