vdso: fix build error
vdso: fix build error

This patch fixes build error due to lack of bool type. It can be fixed adding
include file.

In file included from arch/arm/vdso-pie.c:3:0:
include/vdso.h:41:1: error: unknown type name ‘bool’
include/vdso.h:93:1: error: unknown type name ‘bool’

Signed-off-by: Chanho Park <8ec285a53e21b773fd914e03c50e1b6431bc9aa8@samsung.com>
Signed-off-by: Myungjoo Ham <84146178f7c201fa3079bfc93fccba71d81dffe3@samsung.com>
Acked-by: Alexander Kartashov <5dbba7f06b96156c7ec38c5bd8a847828ec59a50@parallels.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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