freescale/fs_enet:fix repeated words in comments

Delete the redundant word 'a'.
Signed-off-by: Jilin Yuan <yuanjilin@cdjrlc.com>
Link: https://lore.kernel.org/r/20220629125441.62420-1-yuanjilin@cdjrlc.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/freescale/fs_enet/fs_enet.h

@@ -201,7 +201,7 @@ void fs_enet_platform_cleanup(void);
 
 /* access macros */
 #if defined(CONFIG_CPM1)
-/* for a a CPM1 __raw_xxx's are sufficient */
+/* for a CPM1 __raw_xxx's are sufficient */
 #define __cbd_out32(addr, x)	__raw_writel(x, addr)
 #define __cbd_out16(addr, x)	__raw_writew(x, addr)
 #define __cbd_in32(addr)	__raw_readl(addr)