MFC r213316,213333-213334:

MFC r213316,213333-213334:
r213316:
  Fix IFCAP_TXCSUM/IFCAP_RXCSUM handling. Previously bge(4) used
  IFCAP_HWCSUM to know which capability should be changed such that
  disabling RX checksun offloading resulted in disabling TX checksum
  offloading.

r213333:
  Allow write DMA to request larger DMA burst size to get better
  performance on BCM5785.

  Obtained from:	OpenBSD

r213334:
  Remove extra semicolon.

git-svn-id: svn://svn.freebsd.org/base/stable/8@214700 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f