drm/panel: samsung: make vint_table static const

This eliminates the following sparse warning:

drivers/gpu/drm/panel/panel-samsung-s6e3ha2.c:217:15: warning: symbol
'vint_table' was not declared. Should it be static?

While at it, make the table const as it is never modified.

Reported-by: Hulk Robot <[e-mail]>
Signed-off-by: Jason Yan <[e-mail]>
Reviewed-by: Laurent Pinchart <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/panel/panel-samsung-s6e3ha2.c

···
 	  0x00, 0x00 }
 };
 
-unsigned char vint_table[S6E3HA2_VINT_STATUS_MAX] = {
+static const unsigned char vint_table[S6E3HA2_VINT_STATUS_MAX] = {
 	0x18, 0x19, 0x1a, 0x1b, 0x1c,
 	0x1d, 0x1e, 0x1f, 0x20, 0x21
 };