kmp204x: introduce QRIO GPIO functions

The QRIO GPIO functions can be of general interest. They are thus added
to a qrio.c and their prototype are available from kmp204x.h. The QRIO
prst function are also included in this file, as well as the functions
required for the I2C deblocking support (open-drain).

Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>
[York Sun: Remove extra blank line in board/keymile/kmp204x/qrio.c]
Signed-off-by: York Sun <yorksun@freescale.com>
diff --git a/board/keymile/kmp204x/Makefile b/board/keymile/kmp204x/Makefile
index 3e69ee2..c57ca08 100644
--- a/board/keymile/kmp204x/Makefile
+++ b/board/keymile/kmp204x/Makefile
@@ -8,5 +8,5 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-obj-y	:= kmp204x.o ddr.o eth.o tlb.o pci.o law.o \
+obj-y	:= kmp204x.o ddr.o eth.o tlb.o pci.o law.o qrio.o \
 	../common/common.o ../common/ivm.o