ARM: bcm2835: config.mk isn't needed

ARM: bcm2835: config.mk isn't needed

The entries in config.mk were needed so that U-Boot could be built
with an old version of the Raspberry Pi Foundation's toolchain. Without
them, the build would error out with:

...-ld: error: .../libgcc.a(_bswapsi2.o) uses VFP register arguments,
u-boot does not

However, none of the 3 toolchains in the latest version of their
tools.git, nor the Ubuntu/Linaro ARM compilers in at least Ubuntu Quantal
or Saucy, need these options set in order to compile a working U-Boot.
Hence, remove the options for simplicity.

Reported-by: Tom Rini <trini@ti.com>
Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
Reviewed-by: Andreas Färber <afaerber@suse.de>