x86/devicetree: Initialize device tree before using it

Commit 08d53aa5 added CRC32 calculation in early_init_dt_verify() and
checking in late initcall of_fdt_raw_init(), making early_init_dt_verify()
mandatory.

The required call to early_init_dt_verify() was not added to the
x86-specific implementation, causing failure to create the sysfs entry in
of_fdt_raw_init().

Fixes: 08d53aa5

 ("of/fdt: export fdt blob as /sys/firmware/fdt")
Signed-off-by: Ivan Gorinov <ivan.gorinov@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Rob Herring <robh+dt@kernel.org>
Link: https://lkml.kernel.org/r/c8c7e941efc63b5d25ebf9b6350b0f3df38f6098.1520450752.git.ivan.gorinov@intel.com