clk: mediatek: fhctl: Mark local variables static

smatch reports
drivers/clk/mediatek/clk-fhctl.c:17:27: warning: symbol
  'fhctl_offset_v1' was not declared. Should it be static?
drivers/clk/mediatek/clk-fhctl.c:30:27: warning: symbol
  'fhctl_offset_v2' was not declared. Should it be static?

These variables are only used in one file so should be static.

Signed-off-by: Tom Rix <trix@redhat.com>
Link: https://lore.kernel.org/r/20230406010935.1944976-1-trix@redhat.com
Fixes: 8da312d ("clk: mediatek: fhctl: Add support for older fhctl register layout")
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: Tom Rix

drivers/clk/mediatek/clk-fhctl.c

@@ -14,7 +14,7 @@
 #define PERCENT_TO_DDSLMT(dds, percent_m10) \
 	((((dds) * (percent_m10)) >> 5) / 100)
 
-const struct fhctl_offset fhctl_offset_v1 = {
+static const struct fhctl_offset fhctl_offset_v1 = {
 	.offset_hp_en = 0x0,
 	.offset_clk_con = 0x4,
 	.offset_rst_con = 0x8,
@@ -27,7 +27,7 @@ const struct fhctl_offset fhctl_offset_v1 = {
 	.offset_mon = 0x10,
 };
 
-const struct fhctl_offset fhctl_offset_v2 = {
+static const struct fhctl_offset fhctl_offset_v2 = {
 	.offset_hp_en = 0x0,
 	.offset_clk_con = 0x8,
 	.offset_rst_con = 0xc,