media: atomisp: pci: hive_isp_css_common: host: vmem: Replace SUBWORD macros with functions

Replace the macros SUBWORD() and INV_SUBWORD() with functions to comply
with Linux coding style standards.

Link: https://lore.kernel.org/r/20230120182625.23227-1-bpappas@pappasbrent.com



Signed-off-by: Brent Pappas <bpappas@pappasbrent.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>