ENGR00133884 eMMC: improve boot_info message output

ENGR00133884 eMMC: improve boot_info message output

Output bit means of important esd_csd register

Read esd_csd info each time when cat boot_info
becasue user may change config affect esd_csd
value.

boot_info:0x07;
  ALT_BOOT_MODE:1 - Supports alternate boot method
  DDR_BOOT_MODE:1 - Supports alternate dual data rate during boot
  HS_BOOTMODE:1 - Supports high speed timing during boot
boot_size:0512KB
  boot_partition:0x48;
  BOOT_ACK:1 - Boot acknowledge sent during boot operation
  BOOT_PARTITION-ENABLE: 1 - Boot partition 1 enabled
  PARTITION_ACCESS:0 - No access to boot partition
boot_bus:0x01
  BOOT_MODE:0 - Use single data rate + backward compatible timings
in boot operation
  RESET_BOOT_BUS_WIDTH:0 - Reset bus width to x1, single data rate
and backward compatible timings after boot operation
  BOOT_BUS_WIDTH:1 - x4 (sdr/ddr) bus width in boot operation mode

Signed-off-by: Frank Li <Frank.Li@freescale.com>