修改USB电源属性，以满足iPad和iPhone的2.1A快充功能 #25
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默认的配置，在连接IPAD的时候额外的操作电流只有900ma甚至更少，增加USB总供应电流到4100mA，可以把额外的操作电流拉满到1600ma加默认的500ma达到了2100ma。
经过分析主板电路，右侧两个USB口电源取自NB671，该芯片持续电流可达6A，峰值电流有9A。左侧USB口也有限流保护芯片，最高峰值可到2.3A，充个电应该没什么问题。