regulator: lp872x: Fix Wvoid-pointer-to-enum-cast warning

'id' is an enum, thus cast of pointer on 64-bit compile test with W=1
causes:

  lp872x.c:867:5: error: cast to smaller integer type 'enum lp872x_regulator_id' from 'void *' [-Werror,-Wvoid-pointer-to-enum-cast]
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230810111914.204847-3-krzysztof.kozlowski@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/lp872x.c

@@ -864,7 +864,7 @@ static struct lp872x_platform_data
 
 	for (i = 0; i < num_matches; i++) {
 		pdata->regulator_data[i].id =
-				(enum lp872x_regulator_id)match[i].driver_data;
+				(uintptr_t)match[i].driver_data;
 		pdata->regulator_data[i].init_data = match[i].init_data;
 	}
 out: