SD does not use pin MMC_D4. That is only for eMMC (8-bit data).
You only care about the pins that say SD_xxx
38. SD Host Interface
38.1.3 Input/Output Pins
Table 38.1 Pin Configuration
Pin Name Signal Name I/O Function
SD_CLK[1:0]*1 SDCLK Output SD clock
SD_CMD[1:0]*1 SDCMD I/O Command/response
SD_D0[1:0]*1 SDDAT0 I/O Data[bit 0]
SD_D1[1:0]*1 SDDAT1 I/O Data[bit 1]/SDIO interrupt
SD_D2[1:0]*1 SDDAT2 I/O Data[bit 2]/Read wait
SD_D3[1:0]*1 SDDAT3 I/O Data[bit 3]
SD_CD[1:0]*1 ISDCD Input Card detect*2
SD_WP[1:0]*1 ISDWP Input Write protect*2
Note 1. [1:0] indicates the SD Host Interface channel number.
Note 2. When a pin is not in use, fix the corresponding signal to 1.
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