drm/i915: Deduplicate register definition for GAMW_ECO_DEV_RW_IA

This got duplicated on introducing icl workarounds.
Fix by using the older definition and moving the wa bit
definition there. No functional changes.

v3: avoid fixes tag, whitespace (Chris)

References: 908ae051 ("drm/i915/icl: WaDisCtxReload")
Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20181109145333.10570-1-mika.kuoppala@linux.intel.com

drivers/gpu/drm/i915/i915_reg.h

@@ -2400,6 +2400,7 @@ enum i915_power_well_id {
 
 #define GEN8_GAMW_ECO_DEV_RW_IA _MMIO(0x4080)
 #define   GAMW_ECO_ENABLE_64K_IPS_FIELD 0xF
+#define   GAMW_ECO_DEV_CTX_RELOAD_DISABLE	(1 << 7)
 
 #define GAMT_CHKN_BIT_REG	_MMIO(0x4ab8)
 #define   GAMT_CHKN_DISABLE_L3_COH_PIPE			(1 << 31)
@@ -8707,9 +8708,6 @@ enum {
 #define   GEN11_LSN_UNSLCVC_GAFS_HALF_CL2_MAXALLOC	(1 << 9)
 #define   GEN11_LSN_UNSLCVC_GAFS_HALF_SF_MAXALLOC	(1 << 7)
 
-#define GAMW_ECO_DEV_RW_IA_REG			_MMIO(0x4080)
-#define   GAMW_ECO_DEV_CTX_RELOAD_DISABLE	(1 << 7)
-
 #define GEN10_SAMPLER_MODE		_MMIO(0xE18C)
 
 /* IVYBRIDGE DPF */

drivers/gpu/drm/i915/intel_workarounds.c

@@ -867,8 +867,9 @@ static void icl_gt_workarounds_apply(struct drm_i915_private *dev_priv)
 	/* Wa_220166154:icl
 	 * Formerly known as WaDisCtxReload
 	 */
-	I915_WRITE(GAMW_ECO_DEV_RW_IA_REG, I915_READ(GAMW_ECO_DEV_RW_IA_REG) |
-					   GAMW_ECO_DEV_CTX_RELOAD_DISABLE);
+	I915_WRITE(GEN8_GAMW_ECO_DEV_RW_IA,
+		   I915_READ(GEN8_GAMW_ECO_DEV_RW_IA) |
+		   GAMW_ECO_DEV_CTX_RELOAD_DISABLE);
 
 	/* Wa_1405779004:icl (pre-prod) */
 	if (IS_ICL_REVID(dev_priv, ICL_REVID_A0, ICL_REVID_A0))