mfd: rtsx: Make arrays depth and cd_mask static const

Don't populate the arrays depath and cd_mask on the stack but make
them static const.  Makes the object code smaller:

   text    data     bss     dec     hex filename
  25413    7216     448   33077    8135 drivers/mfd/rtsx_pcr.o

   text    data     bss     dec     hex filename
  25151    7360     448   32959    80bf drivers/mfd/rtsx_pcr.o
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

drivers/mfd/rtsx_pcr.c

@@ -644,7 +644,7 @@ int rtsx_pci_switch_clock(struct rtsx_pcr *pcr, unsigned int card_clock,
 {
 	int err, clk;
 	u8 n, clk_divider, mcu_cnt, div;
-	u8 depth[] = {
+	static const u8 depth[] = {
 		[RTSX_SSC_DEPTH_4M] = SSC_DEPTH_4M,
 		[RTSX_SSC_DEPTH_2M] = SSC_DEPTH_2M,
 		[RTSX_SSC_DEPTH_1M] = SSC_DEPTH_1M,
@@ -768,7 +768,7 @@ EXPORT_SYMBOL_GPL(rtsx_pci_card_power_off);
 
 int rtsx_pci_card_exclusive_check(struct rtsx_pcr *pcr, int card)
 {
-	unsigned int cd_mask[] = {
+	static const unsigned int cd_mask[] = {
 		[RTSX_SD_CARD] = SD_EXIST,
 		[RTSX_MS_CARD] = MS_EXIST
 	};