wifi: ath10k: remove unused ath10k_get_ring_byte function

clang with W=1 reports:

drivers/net/wireless/ath/ath10k/ce.c:88:1: error:
  unused function 'ath10k_get_ring_byte' [-Werror,-Wunused-function]
ath10k_get_ring_byte(unsigned int offset,
^
This function is not used so remove it.
Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20230322122855.2570417-1-trix@redhat.com

drivers/net/wireless/ath/ath10k/ce.c

@@ -84,13 +84,6 @@ ath10k_set_ring_byte(unsigned int offset,
 	return ((offset << addr_map->lsb) & addr_map->mask);
 }
 
-static inline unsigned int
-ath10k_get_ring_byte(unsigned int offset,
-		     struct ath10k_hw_ce_regs_addr_map *addr_map)
-{
-	return ((offset & addr_map->mask) >> (addr_map->lsb));
-}
-
 static inline u32 ath10k_ce_read32(struct ath10k *ar, u32 offset)
 {
 	struct ath10k_ce *ce = ath10k_ce_priv(ar);