Fix compiler warning

[brtchip-gdm]

• Fixes for pedantic compiler options in header and source files, e.g. cast-align, strict-prototypes and pedantic.
• Adding missing required header file includes to usbd_startup_dfu.c, usbhx.c.
• Use of gcc builtin macros in ethernet.c, i2cm.c, memctrl.c, usbd_rndis.c, usbh_cdcacm.c, to prevent cast-align warnings.