omap3/am33xx: mux: fix several checkpatch issues

Fix the following checkpatch issues:

CHECK: No space is necessary after a cast
\#39: FILE: arch/arm/include/asm/arch-am33xx/mux.h:39:
+#define PAD_CTRL_BASE  0x800
+#define OFFSET(x)      (unsigned int) (&((struct pad_signals *) \

CHECK: Avoid CamelCase: <CONTROL_PADCONF_JTAG_nTRST>
\#284: FILE: arch/arm/include/asm/arch-omap3/mux.h:284:
+#define CONTROL_PADCONF_JTAG_nTRST     0x0A1C

ERROR: space required after that ',' (ctx:VxV)
\#446: FILE: arch/arm/include/asm/arch-omap3/mux.h:446:
+#define MUX_VAL(OFFSET,VALUE)\
                       ^
Cc: Raphael Assenat <raph@8d.com>
Cc: Ilya Yanok <yanok@emcraft.com>
Cc: Vaibhav Hiremath <hvaibhav@ti.com>
Cc: Peter Barada <peter.barada@logicpd.com>
Cc: Grazvydas Ignotas <notasas@gmail.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Nagendra T S <nagendra@mistralsolutions.com>
Cc: Nishanth Menon <nm@ti.com>
Cc: Tom Rini <trini@ti.com>
Signed-off-by: Igor Grinberg <grinberg@compulab.co.il>
Acked-by: Stefan Roese <sr@denx.de>