u32 PCIe Read Register (u8 type, u32 offset)

1. If type is 1
   1. Write offset to MMIO Register 0x120
   2. Read MMIO Register 0x120
   3. Return MMIO Register 0x124
2. Else if type is 2
   1. Write offset to MMIO Register 0x130
   2. Read MMIO register 0x130
   3. Return MMIO Register 0x134
3. Otherwise
   1. Return 0xFFFFFFFF