[kernel] Invalidate L1 buffers properly, update block drivers to sync #1661
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The kernel L1 buffers were being left mapped to their corresponding block device past a close or unmount, possibly allowing them to be reused with invalid data should another device (floppy or USB drive) be inserted into the same hardware or the contents changed while unmounted.
Also updates all block drivers (BIOS, SSD and RD) to properly do a forced sync and buffer invalidate on close.
Word-aligns L1 buffers.