initrd: Update 'mininit' to latest upstream version

This updates 'mininit' to GIT revision
fd13f3af0dda64094308afa4de4fa3fbce6ad368
MIPS: JZ4770: Don't set deprecated fields of struct musb_hdrc_config

The driver ignores these fields.
MIPS: JZ4770: Fixed and completed USBPCR_IDPULLUP constants
USB: musb: JZ4770: Use constants instead of literals for USBPCR values
USB: musb: JZ4770: Toggle ACT8600 Q1 switch on mode switching
USB: musb: JZ4770: Disable pull-up of ID pin

Previously this was done in the board code, but since the musb glue
is SoC specific anyway, we can do it there instead.
MIPS: JZ4770: GCW0: Pull-up of USB OTG ID pin is now disabled in musb glue

See commit dd8852ac.
USB: musb: Avoid null pointer dereference in debug logging

Since commit 511f3c53 usb_gadget_remove_driver will pass NULL for the
driver argument.
fb: JZ4770: Invert pixel clock polarity

This fixes visible glitches on GCW Zero units from a pre-production
run of the V2.0 PCB. The V1.1 PCB units and the mass production V2.0
PCB units do not have this issue: they look fine with either polarity.