bluetooth: Add check for CONFIG_CNSS_PCI

cnss_get_platform_cap() is only defined for CNSS PCI in
cnss driver, hence modify condition to resolve compilation
issue for non PCI based products.

Change-Id: I5443e4a86d75ae4ed8a7238403c70b0cf913fb1b
Signed-off-by: Sivasri Kumar Vanka <sivasri@codeaurora.org>
Signed-off-by: Suresh Kumar Allam <allamsuresh@codeaurora.org>