Increase petSD's SPI speed from 2.3 to 9.2 MHz
fat-provider: fix broken empty directory mask
fat-provider: fix directory listing

- fill disk name with spaces to 16 characters length
- DIR for directories, PRG for files
- locked attribute for write protected entries
Add debug_dump_packet
Add dummy rtc_settime for compilation without RTC support
Fix Makefile-fatfs-testdemo (some files moved to common/)
fat-provider: centralize code for commands returning res/FS_REPLY