i2c_spi_buses: respect CONFIG_I2C and CONFIG_SPI

- bmp280, dps310, and ms5611 barometers support boards without I2C

platforms/posix/src/px4/generic/generic/include/px4_arch/i2c_hw_description.h

@@ -35,6 +35,7 @@
 
 #include <px4_platform_common/i2c.h>
 
+#if defined(CONFIG_I2C)
 
 static inline constexpr px4_i2c_bus_t initI2CBusInternal(int bus)
 {
@@ -51,3 +52,4 @@ static inline constexpr px4_i2c_bus_t initI2CBusExternal(int bus)
 	ret.is_external = true;
 	return ret;
 }
+#endif // CONFIG_I2C

platforms/posix/src/px4/generic/generic/include/px4_arch/spi_hw_description.h

@@ -35,6 +35,8 @@
 
 #include <px4_platform_common/spi.h>
 
+#if defined(CONFIG_SPI)
+
 static inline constexpr px4_spi_bus_device_t initSPIDevice(uint8_t devid_driver, uint8_t cs_index)
 {
 	px4_spi_bus_device_t ret{};
@@ -57,3 +59,4 @@ static inline constexpr px4_spi_bus_t initSPIBus(int bus, const px4_spi_bus_devi
 	ret.requires_locking = false;
 	return ret;
 }
+#endif // CONFIG_SPI