regulator: lp8788-ldo: make array en_mask static const, makes object smaller

Don't populate the array en_mask on the stack but instead make it
static const. Makes the object code smaller by 87 bytes.

Before:
   text	   data	    bss	    dec	    hex	filename
  12967	   3408	      0	  16375	   3ff7	drivers/regulator/lp8788-ldo.o

After:
   text	   data	    bss	    dec	    hex	filename
  12816	   3472	      0	  16288	   3fa0	drivers/regulator/lp8788-ldo.o

(gcc version 9.2.1, amd64)
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20190906130632.6709-1-colin.king@canonical.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/lp8788-ldo.c

@@ -464,7 +464,7 @@ static int lp8788_config_ldo_enable_mode(struct platform_device *pdev,
 {
 	struct lp8788 *lp = ldo->lp;
 	enum lp8788_ext_ldo_en_id enable_id;
-	u8 en_mask[] = {
+	static const u8 en_mask[] = {
 		[EN_ALDO1]   = LP8788_EN_SEL_ALDO1_M,
 		[EN_ALDO234] = LP8788_EN_SEL_ALDO234_M,
 		[EN_ALDO5]   = LP8788_EN_SEL_ALDO5_M,