arm: mach-k3: am62p: annotate switch/case fallthrough

The MMC boot mode selection for the TI AM62P series of SoCs uses an
implicit switch/case fallthrough for falling back to some default
boot mode.

Add our "fallthrough;" statement-like macro before the default branch in
the code, to avoid a warning when GCC's -Wimplicit-fallthrough warning
option is enabled.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
1 file changed