configs: bump kernel use for RPi, use simpler defconfig

Bump for a slew of USB-related and other fixes.

The bcmrpi defconfig is a huge beast with lots of superfluous drivers.
The brcmrpi_quick defconfig is a stripped down minimalist defconfig with
all that is needed to bring up a RPi with complete HW support, and
nothing superfluous, which is what we need for a board's defconfig in
buildroot.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

configs/rpi_defconfig

@@ -17,7 +17,7 @@ BR2_DEFAULT_KERNEL_VERSION="3.6.11"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_GIT=y
 BR2_LINUX_KERNEL_CUSTOM_GIT_REPO_URL="git://github.com/raspberrypi/linux.git"
-BR2_LINUX_KERNEL_CUSTOM_GIT_VERSION="0006326"
+BR2_LINUX_KERNEL_CUSTOM_GIT_VERSION="1587f77"
 BR2_LINUX_KERNEL_USE_DEFCONFIG=y
-BR2_LINUX_KERNEL_DEFCONFIG="bcmrpi"
+BR2_LINUX_KERNEL_DEFCONFIG="bcmrpi_quick"
 BR2_LINUX_KERNEL_ZIMAGE=y