memory: pl353-smc: Avoid useless acronyms in descriptions

APER does not mean anything, while it seems legitimate to call this
clock the AXI peripheral clock.
Signed-off-by: NMiquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20210610082040.2075611-14-miquel.raynal@bootlin.comSigned-off-by: NKrzysztof Kozlowski <krzysztof.kozlowski@canonical.com>

drivers/memory/pl353-smc.c

@@ -17,7 +17,7 @@
 /**
  * struct pl353_smc_data - Private smc driver structure
  * @memclk:		Pointer to the peripheral clock
- * @aclk:		Pointer to the APER clock
+ * @aclk:		Pointer to the AXI peripheral clock
  */
 struct pl353_smc_data {
 	struct clk		*memclk;