spi: amd: Remove needless rom_addr variable

rom_addr is not used in the code, so we can just drop it from struct
amd_spi.

Signed-off-by: André Almeida <andrealmeid@collabora.com>
Link: https://lore.kernel.org/r/20220211143155.75513-3-andrealmeid@collabora.com
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-amd.c

@@ -38,7 +38,6 @@
 struct amd_spi {
 	void __iomem *io_remap_addr;
 	unsigned long io_base_addr;
-	u32 rom_addr;
 };
 
 static inline u8 amd_spi_readreg8(struct amd_spi *amd_spi, int idx)