gpu: nvgpu: create common/io unit

Moved common/io_common.c to common/io/io.c.
To avoid the naming conflicts, renamed
os/posix/io.c -> os/posix/posix-io.c
os/linux/io.c -> os/linux/linux-io.c

JIRA NVGPU-1995

Change-Id: Ie8a93cb475c5ffcab0e914c4e35743fed198bada
Signed-off-by: Vinod G <vinodg@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2024377
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/gpu/nvgpu/Makefile

@@ -185,7 +185,7 @@ nvgpu-y += \
 	os/linux/vm.o \
 	os/linux/intr.o \
 	os/linux/sysfs.o \
-	os/linux/io.o \
+	os/linux/linux-io.o \
 	os/linux/io_usermode.o \
 	os/linux/rwsem.o \
 	os/linux/comptags.o \
@@ -332,7 +332,7 @@ nvgpu-y += \
 	common/init/hal_init.o \
 	common/sec2/sec2.o \
 	common/sec2/sec2_ipc.o \
-	common/io_common.o \
+	common/io/io.o \
 	common/clock_gating/gm20b_gating_reglist.o \
 	common/clock_gating/gp106_gating_reglist.o \
 	common/clock_gating/gp10b_gating_reglist.o \

drivers/gpu/nvgpu/Makefile.sources

@@ -27,7 +27,7 @@ srcs +=	os/posix/nvgpu.c \
 	os/posix/bitmap.c \
 	os/posix/log.c \
 	os/posix/kmem.c \
-	os/posix/io.c \
+	os/posix/posix-io.c \
 	os/posix/posix-nvgpu_mem.c \
 	os/posix/posix-dma.c \
 	os/posix/posix-vm.c \
@@ -114,7 +114,7 @@ srcs += common/sim.c \
 	common/ltc/ltc_gm20b.c \
 	common/ltc/ltc_gp10b.c \
 	common/ltc/ltc_gv11b.c  \
-	common/io_common.c \
+	common/io/io.c \
 	common/ecc.c \
 	common/ce2.c \
 	common/vbios/bios.c \