kconfig: add missing <stdlib.h> inclusion
kconfig: add missing <stdlib.h> inclusion

This header is needed when using {m,re}alloc(3) and free(3) function family.

Signed-off-by: Arnaud Lacombe <9d114c1f015f0067c68cae2355c88f5c25c17052@gmail.com>

KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas