soc/amd/common/block/spi/fch_spi_util.c: Fix read with invalid length

Fix function call to invoke 16-bit read in 16-bit api instead of 8-bit read.

Signed-off-by: Igor Bagnucki <bagnucki02@gmail.com>
Change-Id: Ifd9079fc6446125e0e58402fdb64bc198bb8e381
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45374
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marc Jones <marc@marcjonesconsulting.com>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

src/soc/amd/common/block/spi/fch_spi_util.c

@@ -29,7 +29,7 @@ uint8_t spi_read8(uint8_t reg)
 
 uint16_t spi_read16(uint8_t reg)
 {
-	return read8((void *)(spi_get_bar() + reg));
+	return read16((void *)(spi_get_bar() + reg));
 }
 
 uint32_t spi_read32(uint8_t reg)