ARM64: juno: add NOR flash to device tree

The Juno motherboard has a NOR flash on the motherboard, enable
this to be accessed with the CFI flash driver. Results after
enabling MTD, MTD_CFI, MTD_PHYSMAP, MTD_PHYSMAP_OF,
MTD_CFI_INTELEXT:

8000000.flash: Found 2 x16 devices at 0x0 in 32-bit bank.
Manufacturer ID 0x000089 Chip ID 0x008919
Intel/Sharp Extended Query Table at 0x010A
Intel/Sharp Extended Query Table at 0x010A
Intel/Sharp Extended Query Table at 0x010A
Intel/Sharp Extended Query Table at 0x010A
Intel/Sharp Extended Query Table at 0x010A
Using buffer write method
Using auto-unlock on power-up/resume
cfi_cmdset_0001: Erase suspend on write enabled
erase region 0: offset=0x0,size=0x40000,blocks=255
erase region 1: offset=0x3fc0000,size=0x10000,blocks=4

Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Liviu Dudau <Liviu.Dudau@arm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>