misc: pci_endpoint_test: select CRC32

There is the following link error with CONFIG_PCI_ENDPOINT_TEST=y and
CONFIG_CRC32=m:

drivers/built-in.o: In function 'pci_endpoint_test_ioctl':
pci_endpoint_test.c:(.text+0xf1251): undefined reference to 'crc32_le'
pci_endpoint_test.c:(.text+0xf1322): undefined reference to 'crc32_le'
pci_endpoint_test.c:(.text+0xf13b2): undefined reference to 'crc32_le'
pci_endpoint_test.c:(.text+0xf141e): undefined reference to 'crc32_le'

Fix this by selecting CRC32 in the PCI_ENDPOINT_TEST kconfig entry.

Fixes: 2c156ac7 ("misc: Add host side PCI driver for PCI test function device")
Signed-off-by: Tobias Regnery <tobias.regnery@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>