Add support for Allwinner F1Cx00s family

Allwinner F1Cx00s family is a series of SoCs
with Mentor MUSB controller and HS phy. It comes
with a slightly different register space layout,
and some quirks, so it's not multiplexed with
the existing musb support library.

This library currently requires to be compiled
with https://github.com/hongxuyao/F1C100s_with_Keil_RTX4_emWin5

src/device/dcd_attr.h

@@ -195,6 +195,10 @@
 #elif TU_CHECK_MCU(OPT_MCU_XMC4000)
   #define DCD_ATTR_ENDPOINT_MAX   8
 
+//------------ Allwinner -------------//
+#elif TU_CHECK_MCU(OPT_MCU_F1C100S)
+  #define DCD_ATTR_ENDPOINT_MAX   4
+
 #else
   #warning "DCD_ATTR_ENDPOINT_MAX is not defined for this MCU, default to 8"
   #define DCD_ATTR_ENDPOINT_MAX   8