tools: build msdostools for omap

omap requires msdos partition to boot from sdcard.
Prepare for upcoming full sdcard image generation.

Signed-off-by: Alexander Couzens <lynxis@fe80.eu>

tools/Makefile

@@ -36,7 +36,7 @@ tools-$(CONFIG_TARGET_orion_generic) += wrt350nv2-builder upslug2
 tools-$(CONFIG_powerpc) += upx
 tools-$(CONFIG_TARGET_x86) += qemu
 tools-$(CONFIG_TARGET_mxs) += elftosb sdimage
-tools-$(CONFIG_TARGET_brcm2708)$(CONFIG_TARGET_sunxi)$(CONFIG_TARGET_mxs) += mtools dosfstools
+tools-$(CONFIG_TARGET_brcm2708)$(CONFIG_TARGET_sunxi)$(CONFIG_TARGET_mxs)$(CONFIG_TARGET_omap) += mtools dosfstools
 tools-$(CONFIG_TARGET_ar71xx) += lzma-old squashfs
 tools-y += lzma squashfs4
 tools-$(BUILD_B43_TOOLS) += b43-tools