Rename SPL_MUSB_NEW_SUPPORT to SPL_MUSB_NEW

Rename this option so that CONFIG_IS_ENABLED can be used with it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/am335x_guardian_defconfig b/configs/am335x_guardian_defconfig
index 75c196b..878e48a 100644
--- a/configs/am335x_guardian_defconfig
+++ b/configs/am335x_guardian_defconfig
@@ -31,7 +31,7 @@
 CONFIG_SPL_ENV_SUPPORT=y
 CONFIG_SPL_ETH=y
 CONFIG_SPL_I2C_SUPPORT=y
-CONFIG_SPL_MUSB_NEW_SUPPORT=y
+CONFIG_SPL_MUSB_NEW=y
 CONFIG_SPL_NAND_DRIVERS=y
 CONFIG_SPL_NAND_ECC=y
 CONFIG_SPL_NAND_BASE=y