base: soc: rename and export soc_device_get_machine()

base: soc: rename and export soc_device_get_machine()

Some SoC drivers reimplement the functionality of
soc_device_get_machine(). Make this function accessible through the
sys_soc.h header and rename it to a more descriptive name.

Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260223-soc-of-root-v2-4-b45da45903c8@oss.qualcomm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>