avutil/hwcontext: use CONFIG_QSV instead of CONFIG_LIBMFX for qsv

See "[FFmpeg-devel] [PATCH] hwcontext: add a QSV implementation"
Suggested-by: nablet developer <sdk@nablet.com>
Signed-off-by: James Almer <jamrial@gmail.com>

libavutil/Makefile

@@ -155,7 +155,7 @@ OBJS-$(!HAVE_ATOMICS_NATIVE)            += atomic.o                     \
 
 OBJS-$(CONFIG_CUDA)                     += hwcontext_cuda.o
 OBJS-$(CONFIG_DXVA2)                    += hwcontext_dxva2.o
-OBJS-$(CONFIG_LIBMFX)                   += hwcontext_qsv.o
+OBJS-$(CONFIG_QSV)                   += hwcontext_qsv.o
 OBJS-$(CONFIG_LZO)                      += lzo.o
 OBJS-$(CONFIG_OPENCL)                   += opencl.o opencl_internal.o
 OBJS-$(CONFIG_VAAPI)                    += hwcontext_vaapi.o
@@ -168,7 +168,7 @@ SLIBOBJS-$(HAVE_GNU_WINDRES)            += avutilres.o
 
 SKIPHEADERS-$(CONFIG_CUDA)             += hwcontext_cuda.h
 SKIPHEADERS-$(CONFIG_DXVA2)            += hwcontext_dxva2.h
-SKIPHEADERS-$(CONFIG_LIBMFX)           += hwcontext_qsv.h
+SKIPHEADERS-$(CONFIG_QSV)           += hwcontext_qsv.h
 SKIPHEADERS-$(CONFIG_VAAPI)            += hwcontext_vaapi.h
 SKIPHEADERS-$(CONFIG_VDPAU)            += hwcontext_vdpau.h
 SKIPHEADERS-$(HAVE_ATOMICS_GCC)        += atomic_gcc.h

libavutil/hwcontext.c

@@ -35,7 +35,7 @@ static const HWContextType *hw_table[] = {
 #if CONFIG_DXVA2
     &ff_hwcontext_type_dxva2,
 #endif
-#if CONFIG_LIBMFX
+#if CONFIG_QSV
     &ff_hwcontext_type_qsv,
 #endif
 #if CONFIG_VAAPI