video: mxsfb: add missing include of linux/module.h

Include linux/module.h to fix below build error:

                 from drivers/video/mxsfb.c:42:
arch/arm/mach-mxs/include/mach/memory.h:22:1: warning: this is the location of the previous definition
drivers/video/mxsfb.c:574: error: 'THIS_MODULE' undeclared here (not in a function)
drivers/video/mxsfb.c:893: warning: data definition has no type or storage class
drivers/video/mxsfb.c:893: warning: type defaults to 'int' in declaration of 'MODULE_DEVICE_TABLE'
drivers/video/mxsfb.c:893: warning: parameter names (without types) in function declaration
drivers/video/mxsfb.c:917: error: expected declaration specifiers or '...' before string constant
drivers/video/mxsfb.c:917: warning: data definition has no type or storage class
drivers/video/mxsfb.c:917: warning: type defaults to 'int' in declaration of 'MODULE_DESCRIPTION'
drivers/video/mxsfb.c:917: warning: function declaration isn't a prototype
drivers/video/mxsfb.c:918: error: expected declaration specifiers or '...' before string constant
drivers/video/mxsfb.c:918: warning: data definition has no type or storage class
drivers/video/mxsfb.c:918: warning: type defaults to 'int' in declaration of 'MODULE_AUTHOR'
drivers/video/mxsfb.c:918: warning: function declaration isn't a prototype
drivers/video/mxsfb.c:919: error: expected declaration specifiers or '...' before string constant
drivers/video/mxsfb.c:919: warning: data definition has no type or storage class
drivers/video/mxsfb.c:919: warning: type defaults to 'int' in declaration of 'MODULE_LICENSE'
drivers/video/mxsfb.c:919: warning: function declaration isn't a prototype
make[2]: *** [drivers/video/mxsfb.o] Error 1
make[1]: *** [drivers/video] Error 2
make: *** [drivers] Error 2

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

drivers/video/mxsfb.c

@@ -39,6 +39,7 @@
  * the required value in the imx_fb_videomode structure.
  */
 
+#include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>