fbdev: sisfb: hide unused variables

[ Upstream commit 688cf598665851b9e8cb5083ff1d208ce43d10ff ]

Building with W=1 shows that a couple of variables in this driver are only
used in certain configurations:

drivers/video/fbdev/sis/init301.c:239:28: error: 'SiS_Part2CLVX_6' defined but not used [-Werror=unused-const-variable=]
  239 | static const unsigned char SiS_Part2CLVX_6[] = {   /* 1080i */
      |                            ^~~~~~~~~~~~~~~
drivers/video/fbdev/sis/init301.c:230:28: error: 'SiS_Part2CLVX_5' defined but not used [-Werror=unused-const-variable=]
  230 | static const unsigned char SiS_Part2CLVX_5[] = {   /* 750p */
      |                            ^~~~~~~~~~~~~~~
drivers/video/fbdev/sis/init301.c:211:28: error: 'SiS_Part2CLVX_4' defined but not used [-Werror=unused-const-variable=]
  211 | static const unsigned char SiS_Part2CLVX_4[] = {   /* PAL */
      |                            ^~~~~~~~~~~~~~~
drivers/video/fbdev/sis/init301.c:192:28: error: 'SiS_Part2CLVX_3' defined but not used [-Werror=unused-const-variable=]
  192 | static const unsigned char SiS_Part2CLVX_3[] = {  /* NTSC, 525i, 525p */
      |                            ^~~~~~~~~~~~~~~
drivers/video/fbdev/sis/init301.c:184:28: error: 'SiS_Part2CLVX_2' defined but not used [-Werror=unused-const-variable=]
  184 | static const unsigned char SiS_Part2CLVX_2[] = {
      |                            ^~~~~~~~~~~~~~~
drivers/video/fbdev/sis/init301.c:176:28: error: 'SiS_Part2CLVX_1' defined but not used [-Werror=unused-const-variable=]
  176 | static const unsigned char SiS_Part2CLVX_1[] = {
      |                            ^~~~~~~~~~~~~~~

This started showing up after the definitions were moved into the
source file from the header, which was not flagged by the compiler.
Move the definition into the appropriate #ifdef block that already
exists next to them.

Fixes: 5908986e ("video: fbdev: sis: avoid mismatched prototypes")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>