amd/stoneyridge: Fix pm_read16 argument size

Make pm_read16() consistent with the other PM register access functions.

Change-Id: Iba017b8090ed07d8684cc7f396a3e9a942b3ad95
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/21748
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Marc Jones <marc@marcjonesconsulting.com>

src/soc/amd/stoneyridge/include/soc/southbridge.h

@@ -189,7 +189,7 @@ void sb_tpm_decode_spi(void);
 void lpc_wideio_512_window(uint16_t base);
 void lpc_wideio_16_window(uint16_t base);
 u8 pm_read8(u8 reg);
-u16 pm_read16(u16 reg);
+u16 pm_read16(u8 reg);
 void pm_write8(u8 reg, u8 value);
 void pm_write16(u8 reg, u16 value);
 int s3_load_nvram_early(int size, u32 *old_dword, int nvram_pos);

src/soc/amd/stoneyridge/southbridge.c

@@ -53,7 +53,7 @@ void pm_write16(u8 reg, u16 value)
 	write16((void *)(PM_MMIO_BASE + reg), value);
 }
 
-u16 pm_read16(u16 reg)
+u16 pm_read16(u8 reg)
 {
 	return read16((void *)(PM_MMIO_BASE + reg));
 }