kernel: Clean up kernel cmdline

 * Console is overwritten by the bootloader
 * CONFIG_DEBUG_USER is disabled, so no need to keep user_debug
   and the same goes for msm_rtb, which depends on CONFIG_MSM_RTB

BoardConfig.mk

@@ -62,7 +62,7 @@ ENABLE_CPUSETS := true
 TARGET_USES_64_BIT_BINDER := true
 
 # Kernel
-BOARD_KERNEL_CMDLINE := console=tty60,115200,n8 androidboot.hardware=qcom user_debug=31 msm_rtb.filter=0x237 ehci-hcd.park=3 lpm_levels.sleep_disabled=1 cma=16M@0-0xffffffff
+BOARD_KERNEL_CMDLINE := androidboot.hardware=qcom ehci-hcd.park=3 lpm_levels.sleep_disabled=1 cma=16M@0-0xffffffff
 BOARD_KERNEL_BASE := 0x80000000
 BOARD_KERNEL_PAGESIZE := 4096
 BOARD_KERNEL_TAGS_OFFSET := 0x00000100