drm: Fix HDCP downstream dev count read

In both HDMI and DP, device count is represented by 6:0 bits of a
register(BInfo/Bstatus)

So macro for bitmasking the device_count is fixed(0x3F->0x7F).

v3:
  Retained the Rb-ed.
v4:
  %s/drm\/i915/drm [rodrigo]
v5:
  Added "Fixes:" and HDCP keyword in subject [Rodrigo, Sean Paul]
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Fixes: 495eb7f8 drm: Add some HDCP related #defines
cc: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1522929802-22850-1-git-send-email-ramalingam.c@intel.com

include/drm/drm_hdcp.h

@@ -19,7 +19,7 @@
 #define DRM_HDCP_RI_LEN				2
 #define DRM_HDCP_V_PRIME_PART_LEN		4
 #define DRM_HDCP_V_PRIME_NUM_PARTS		5
-#define DRM_HDCP_NUM_DOWNSTREAM(x)		(x & 0x3f)
+#define DRM_HDCP_NUM_DOWNSTREAM(x)		(x & 0x7f)
 #define DRM_HDCP_MAX_CASCADE_EXCEEDED(x)	(x & BIT(3))
 #define DRM_HDCP_MAX_DEVICE_EXCEEDED(x)		(x & BIT(7))