3.18-stable patches

3.18-stable patches

added patches:
	cfg80211-check-if-pmkid-attribute-is-of-expected-size.patch
	cfg80211-define-nla_policy-for-nl80211_attr_local_mesh_power_mode.patch
	cfg80211-validate-frequencies-nested-in-nl80211_attr_scan_frequencies.patch
	checkpatch-silence-perl-5.26.0-unescaped-left-brace-warnings.patch
	exec-limit-arg-stack-to-at-most-75-of-_stk_lim.patch
	fs-dcache.c-fix-spin-lockup-issue-on-nlru-lock.patch
	irqchip-gic-v3-fix-out-of-bound-access-in-gic_set_affinity.patch
	kernel-extable.c-mark-core_kernel_text-notrace.patch
	mm-fix-overflow-check-in-expand_upwards.patch
	parisc-dma-api-return-error-instead-of-bug_on-for-dma-ops-on-non-dma-devs.patch
	parisc-mm-ensure-irqs-are-off-in-switch_mm.patch
	parisc-report-sigsegv-instead-of-sigbus-when-running-out-of-stack.patch
	parisc-use-compat_sys_keyctl.patch
	tools-lib-lockdep-reduce-max_lock_depth-to-avoid-overflowing-lock_chain-depth.patch
	vt-fix-unchecked-__put_user-in-tioclinux-ioctls.patch