selftests: pci_endpoint: Skip BAR subrange test on -ENOSPC

In pci-epf-test.c, set the STATUS_NO_RESOURCE status bit if
pci_epc_set_bar() returns -ENOSPC.  This status bit is used to indicate
that there are not enough inbound window resources to allocate the
subrange.

In pci_endpoint_test.c, return -ENOSPC instead of -EIO when
STATUS_NO_RESOURCE is set.

In pci_endpoint_test.c, skip the BAR subrange test if -ENOSPC, i.e., there
are not enough inbound window resources to run the test.

Signed-off-by: Christian Bruel <christian.bruel@foss.st.com>
[mani: commit log]
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
[bhelgaas: squash related commits]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Koichiro Den <den@valinux.co.jp>
Link: https://patch.msgid.link/20260407-skip-bar_subrange-tests-if-enospc-v4-1-6f2e65f2298c@foss.st.com
Link: https://patch.msgid.link/20260407-skip-bar_subrange-tests-if-enospc-v4-2-6f2e65f2298c@foss.st.com
Link: https://patch.msgid.link/20260407-skip-bar_subrange-tests-if-enospc-v4-3-6f2e65f2298c@foss.st.com

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