feat(hid): Enhance consumer report to support higher codes

Switch from single byte to double byte usages.

Allow the entire 0x0C page for future compatibility.

Closes zmkfirmware#234.  Co-requisite of zmkfirmware#21.

app/include/zmk/hid.h

@@ -116,18 +116,20 @@ static const u8_t zmk_hid_report_desc[] = {
     /* LOGICAL_MINIMUM (0) */
     HID_GI_LOGICAL_MIN(1),
     0x00,
-    /* LOGICAL_MAXIMUM (1) */
-    HID_GI_LOGICAL_MAX(1),
+    /* LOGICAL_MAXIMUM (0xFFFF) */
+    HID_GI_LOGICAL_MAX(2),
+    0xFF,
     0xFF,
     HID_LI_USAGE_MIN(1),
     0x00,
-    /* USAGE_MAXIMUM (Keyboard Application) */
-    HID_LI_USAGE_MAX(1),
+    /* USAGE_MAXIMUM (0xFFFF) */
+    HID_LI_USAGE_MAX(2),
+    0xFF,
     0xFF,
     /* INPUT (Data,Ary,Abs) */
-    /* REPORT_SIZE (8) */
+    /* REPORT_SIZE (16) */
     HID_GI_REPORT_SIZE,
-    0x08,
+    0x10,
     /* REPORT_COUNT (ZMK_HID_CONSUMER_NKRO_SIZE) */
     HID_GI_REPORT_COUNT,
     ZMK_HID_CONSUMER_NKRO_SIZE,
@@ -156,7 +158,7 @@ struct zmk_hid_keypad_report {
 } __packed;
 
 struct zmk_hid_consumer_report_body {
-    u8_t keys[ZMK_HID_CONSUMER_NKRO_SIZE];
+    u16_t keys[ZMK_HID_CONSUMER_NKRO_SIZE];
 } __packed;
 
 struct zmk_hid_consumer_report {