OMAP3: Use functions print_cpuinfo() and checkboard()

Use the functions print_cpuinfo() and checkboard() to
display the cpu and board specific information.

These functions reuse content from the existing function
display_board_info() - which has been removed.

Also, updated the existig OMAP3 configurations to
define:
 - CONFIG_DISPLAY_CPUINFO
 - CONFIG_DISPLAY_BOARDINFO

Signed-off-by: Sanjeev Premi <premi@ti.com>

include/asm-arm/arch-omap3/sys_proto.h

@@ -47,7 +47,6 @@ u32 is_gpmc_muxed(void);
 u32 get_gpmc0_type(void);
 u32 get_gpmc0_width(void);
 u32 get_board_type(void);
-void display_board_info(u32);
 u32 get_sdr_cs_size(u32);
 u32 get_sdr_cs_offset(u32);
 u32 is_running_in_sdram(void);