configs: bump kernel in rpi_defconfig for misc fixes

Fixes in GPIOs, I2C and DMA.

And since the RPi git tree fork has a non-upstream driver
for rtl8192c WiFi USB stick, there's a fix for that, too.

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="5d5301e"
+BR2_LINUX_KERNEL_CUSTOM_GIT_VERSION="5516fc2"
 BR2_LINUX_KERNEL_USE_DEFCONFIG=y
 BR2_LINUX_KERNEL_DEFCONFIG="bcmrpi"
 BR2_LINUX_KERNEL_ZIMAGE=y