ASoC: stm32: sai: Remove useless define

STM_SAI_IS_SUB_B(x) and STM_SAI_BLOCK_NAME(x) are
not being used, so remove them.
Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Acked-by: Olivier Moysan <olivier.moysan@st.com>
Link: https://lore.kernel.org/r/20220525135023.6792-1-tangbin@cmss.chinamobile.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/stm/stm32_sai_sub.c

@@ -45,8 +45,6 @@
 #define STM_SAI_B_ID		0x1
 
 #define STM_SAI_IS_SUB_A(x)	((x)->id == STM_SAI_A_ID)
-#define STM_SAI_IS_SUB_B(x)	((x)->id == STM_SAI_B_ID)
-#define STM_SAI_BLOCK_NAME(x)	(((x)->id == STM_SAI_A_ID) ? "A" : "B")
 
 #define SAI_SYNC_NONE		0x0
 #define SAI_SYNC_INTERNAL	0x1