CONFIG_MACH_OMAP_LDP is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

OMAP3 LDP board

modulename: board-ldp.ko

configname: CONFIG_MACH_OMAP_LDP

Linux Kernel Configuration
└─>OMAP3 LDP board
In linux kernel since version 2.6.28 (release Date: 2008-12-24)  
source code:
/arch/arm/mach-omap2/

depends
CONFIG_ARCH_OMAP3 or CONFIG_ARCH_OMAP2PLUS |
| CONFIG_ARCH_MULTI_V6 or CONFIG_ARCH_MULTI_V7