firmware: xilinx: Fix incorrect names in kernel-doc

There are some c&p issues reported by kernel-doc as:
drivers/firmware/xilinx/zynqmp.c:676: warning: expecting prototype for
zynqmp_pm_write_ggs(). Prototype was for zynqmp_pm_read_ggs() instead
drivers/firmware/xilinx/zynqmp.c:710: warning: expecting prototype for
zynqmp_pm_write_pggs(). Prototype was for zynqmp_pm_read_pggs() instead
drivers/firmware/xilinx/zynqmp.c:1023: warning: expecting prototype for
zynqmp_pm_aes(). Prototype was for zynqmp_pm_aes_engine() instead
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/a81edd4fc6cff4bd7e4984fceda941b9e9ab01bf.1628245954.git.michal.simek@xilinx.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/firmware/xilinx/zynqmp.c

@@ -664,7 +664,7 @@ int zynqmp_pm_write_ggs(u32 index, u32 value)
 EXPORT_SYMBOL_GPL(zynqmp_pm_write_ggs);
 
 /**
- * zynqmp_pm_write_ggs() - PM API for reading global general storage (ggs)
+ * zynqmp_pm_read_ggs() - PM API for reading global general storage (ggs)
  * @index:	GGS register index
  * @value:	Register value to be written
  *
@@ -697,7 +697,7 @@ int zynqmp_pm_write_pggs(u32 index, u32 value)
 EXPORT_SYMBOL_GPL(zynqmp_pm_write_pggs);
 
 /**
- * zynqmp_pm_write_pggs() - PM API for reading persistent global general
+ * zynqmp_pm_read_pggs() - PM API for reading persistent global general
  *			     storage (pggs)
  * @index:	PGGS register index
  * @value:	Register value to be written
@@ -1029,7 +1029,7 @@ int zynqmp_pm_load_pdi(const u32 src, const u64 address)
 EXPORT_SYMBOL_GPL(zynqmp_pm_load_pdi);
 
 /**
- * zynqmp_pm_aes - Access AES hardware to encrypt/decrypt the data using
+ * zynqmp_pm_aes_engine - Access AES hardware to encrypt/decrypt the data using
  * AES-GCM core.
  * @address:	Address of the AesParams structure.
  * @out:	Returned output value