Update to 4.9-rc1.
    
    - Eliminated 14 patches.
    - ARM configs need updating.
    - Config changes:
      - General:
        - VMAP_STACK=y (where supported)
    
      - GCC plugins:
        - GCC_PLUGIN_LATENT_ENTROPY=n (fork/irq overhead)
    
      - CPUFREQ:
        - CPU_FREQ_GOV_SCHEDUTIL=y
    
      - x86:
        - MLX_PLATFORM=m
        - INTEL_ISH_HID=m
        - SND_SOC_INTEL_BDW_RT5677_MACH=m
        - SERIAL_8250_LPSS=y (i386)
    
      - PCI:
        - PCIE_PTM=y
    
      - Networking:
        - TCP_CONG_BBR=m
        - NFT_NUMGEN=m
        - NFT_SET_RBTREE=m
        - NFT_SET_HASH=m
        - NFT_QUOTA=m
        - NET_ACT_SKBMOD=m
        - NET_ACT_TUNNEL_KEY=m
        - NET_IFE_SKBTCINDEX=m
        - BATMAN_ADV_DEBUGFS=y
        - BT_HCIUART_MRVL=y
        - AF_RXRPC_IPV6=y
        - AF_RXRPC_INJECT_LOSS=n
        - ENA_ETHERNET=m
        - MICROSEMI_PHY=m
        - CRYPTO_DEV_CHELSIO=m
        - INFINIBAND_QEDR=m
    
      - GPIO:
        - INPUT_GPIO_DECODER=m
        - GPIO_MOCKUP=m
        - GPIO_GPIO_MM=m
        - GPIO_TS4900=m
    
      - DRM:
        - DRM_AMDGPU_SI=y
        - DRM_PANEL_JDI_LT070ME05000=n
        - DRM_DUMB_VGA_DAC=m
        - DRM_LEGACY (this may impact users with older hardware)
    
      - Sound:
        - SND_SOC_NAU88C10=m
        - SND_SIMPLE_SCU_CARD=m
    
      - USB:
        - USB_LEDS_TRIGGER_USBPORT=m
        - USBIP_VHCI_HC_PORTS=8 (default)
        - USBIP_VHCI_NR_HCS=1 (default)
        - USB_HSIC_USB4604=m
    
      - Other:
        - LEDS_IS31FL319X=m
        - RTC_DRV_DS1307_CENTURY=y
        - WDAT_WDT=m
        - WATCHDOG_PRETIMEOUT_GOV_PANIC=m
        - WATCHDOG_PRETIMEOUT_GOV_NOOP=y
        - VIDEO_TW5864=m
        - CONFIG_LEDS_MLXCPLD=m
        - SCSI_SMARTPQI=m
        - TOUCHSCREEN_EKTF2127=m
    
      - syzkaller config:
        - UBSAN_NULL=y