Unless you have a degree in computer hardware engineering, almost nothing in those logs will make sense to you. RT Buddy is part of the kernel, loading during boot on every iPhone, iPad and Mac. I don’t know exactly what is does but it is part of the hardware initialization steps towards the end of the kernel boot process.
And yes, Apple devices do use chips made by Samsung. Also ones made by Texas Instruments, Panasonic, and other companies that make various controller and other chipsets. They may also use RAM & DRAM chips made by Samsung.
The Samsung SPI Controller is a common hardware system on many devices, and controls the I/O with things like USB flash drives, displays controllers or anything that uses the SPI (serial peripheral interface) comm interface standard.
Sandollar has been around since the introduction of NFC payment processing and has something to do with security or token authentication or some such aspect of NFC system.
So you’re asking about things that are at the extreme of the spectrum of obscure and more often than not tightly guarded proprietary systems developed by Apple (and code named by them, or the companies that make the proprietary components that Apple uses. Your never going to find details about them as those details are not made public by the companies that own the IP and technology.