dpdk: move submodule to eb167868

This picks up:

eb167868: eal/windows: fix debug build with MinGW
3f84d847: bus/pci: set Windows device class and bus

Both of these have been merged into DPDK upstream/main,
but adding them to our spdk-v20.11 branch until we
are ready to upgrade our submodule to a DPDK version
that includes them.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: I2b7e31ecc3d66f2b2c09c7afa6e47d4f0f9f96c3

Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/7543


Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>