drm/i915: Fix trivial typos in comments and warning message

Change 'mutliple' to 'multiple'
Change 'mutlipler' to 'multiplier'
Change 'Haswel' to 'Haswell'

Signed-off-by: Yannick Guerrini <yguerrini@tomshardware.fr>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --cc drivers/gpu/drm/i915/i915_gem_execbuffer.c
Simple merge

diff --cc drivers/gpu/drm/i915/i915_reg.h
Simple merge

diff --cc drivers/gpu/drm/i915/intel_sdvo.c
Simple merge