2. 恢复了1052的BSP的初始配置

2. 在IMXRT的Libraries中增加了peripherals目录，用于具体型号的设备驱动相关的代码的实现，不应与MCU的平台相关，实现PHY的设备对象中的相关接口。
3. 修改了BSP中的Sconstruct文件，增加了peripherals目录的构建
4. 修改了KEIL环境的SCT文件，用于实现以太网功能

Signed-off-by: chenyong <1521761801@qq.com>

1. Add "drv_eth.c" for all imxrt platforms.
2. Add ksz8081 phy driver for imxrt1052-nxp-evk board.
3. Disable the LED demo in main.c file if enable the ENET
   and ksz8081 phy, because the PINs of LED and ksz8081
   reset are from the same GPIO.
4. Update the relevant Kconfig and Sconscript files.
Signed-off-by: NGavin Liu <gavin-liugang@outlook.com>

Add ramfs (8MB size) support for imxrt1052-nxp-evk board.
Signed-off-by: NGavin Liu <gavin-liugang@outlook.com>

1. Add sdram item in bsp/imxrt/imxrt1052-nxp-evk/board/Kconfig
2. Add sdram configuration header file for imxrt1052-nxp-evk
3. Update the sdram space assignment for memheap
Signed-off-by: NGavin Liu <gavin-liugang@outlook.com>