MLK-12054-1 media: video: fix multiple definition error in MIPI DSI driver

MLK-12054-1 media: video: fix multiple definition error in MIPI DSI driver

When enable CONFIG_FB_MXC_MIPI_DSI, meet following compiling error.

drivers/video/fbdev/mxc/mipi_dsi_samsung.o: In function `mipi_dsi_pkt_write':
mipi_dsi_samsung.c:(.text+0x818): multiple definition of `mipi_dsi_pkt_write'
drivers/video/fbdev/mxc/mipi_dsi.o:mipi_dsi.c:(.text+0xa74): first defined here
drivers/video/fbdev/mxc/mipi_dsi_samsung.o: In function `mipi_dsi_pkt_read':
mipi_dsi_samsung.c:(.text+0x9d8): multiple definition of `mipi_dsi_pkt_read'
drivers/video/fbdev/mxc/mipi_dsi.o:mipi_dsi.c:(.text+0xc5c): first defined here
drivers/video/fbdev/mxc/mipi_dsi_samsung.o: In function `mipi_dsi_dcs_cmd':
mipi_dsi_samsung.c:(.text+0xa88): multiple definition of `mipi_dsi_dcs_cmd'
drivers/video/fbdev/mxc/mipi_dsi.o:mipi_dsi.c:(.text+0xdb0): first defined here
make[4]: *** [drivers/video/fbdev/mxc/built-in.o] Error 1
make[3]: *** [drivers/video/fbdev/mxc] Error 2
make[2]: *** [drivers/video/fbdev] Error 2
make[1]: *** [drivers/video] Error 2

move three dsi packet related functions to mipi_dsi_info
structure. This will avoid the multiple definition compiling
issue. This is what the commit f54c7527895575a2e474b17a4752724977b898ea does
in 3.14.y

Signed-off-by: Robby Cai <robby.cai@nxp.com>