brcm47xx: upgrade to kernel 2.6.27.6.

This should be save now.

SVN-Revision: 26533

target/linux/brcm47xx/Makefile

@@ -11,7 +11,7 @@ BOARD:=brcm47xx
 BOARDNAME:=Broadcom BCM947xx/953xx
 FEATURES:=squashfs usb pcmcia
 
-LINUX_VERSION:=2.6.36.4
+LINUX_VERSION:=2.6.37.6
 
 include $(INCLUDE_DIR)/target.mk
 DEFAULT_PACKAGES += wpad-mini kmod-switch kmod-diag nvram