ARM: versatile: mark mmc_status() static

mmc_status() is only used in the file it is defined in, and
no longer has an 'extern' declaration:

arch/arm/mach-versatile/versatile.c:56:14: error: no previous prototype for 'mmc_status'

Fixes: 16956fed35fe ("ARM: versatile: switch to DT only booting and remove legacy code")
Link: https://lore.kernel.org/r/20230516153109.514251-14-arnd@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

ARM: versatile: move integrator/realview/vexpress to versatile

These are all fairly small platforms by now, and they are
closely related. Just move them all into a single directory.

Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Tested-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>